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5 Planning the installation
Planning the connection of the solar modules (DC)
5.5.3 Arrangement of the DC inputs on the DC
connection panel
The inverter has 6 DC inputs (DC1 to DC6), each with three DC
connections. Up to 1218 module strings can be connected to the
inverter. Each DC input has its own MPP tracker.
DC1-1
DC 1
DC 1
DC2-1
DC 2
DC 2
DC3-1
DC 3
DC 3
DC4-1
DC 4
DC 4
DC5-1
DC 5
DC 5
DC 6
DC 6
DC6-1
1
1
Fig. 5.23:
Arrangement of the DC inputs on the DC connection
panel
44
DC1-2
DC1-3
DC2-2
DC2-3
DC3-2
DC3-3
DC4-2
DC4-3
DC5-2
DC5-3
DC6-2
DC6-3
2
2
3
3
5.5.4 Functioning of integrated string monitoring
The string is monitored via current sensors. Fig. 5.24 shows the
distribution of the current sensors to the module strings of a DC
input.
A
I
1
CT 1
DC x
1
Fig. 5.24:
Arrangement of the current sensors of a DC input
DC connections 1 and 3 each have a current sensor (CT 1 and
CT 2). Current sensor CT 3 measures the total current of all three
module strings. The current in module string 2 is calculated by
the difference: I
= I
- (I
+I
2
ges
1
Installation and operation manual M70A_260 Flex RPI703M26000 EU V1.1 EN 2022-08-02
A
I
ges
CT 3
A
I
I
2
3
CT 2
2
3
).
3
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